Simpler Go script to reproduce loss ob sign bit

gistfile1.go

package main

import (
	"fmt"
	"github.com/gocql/gocql"
	"time"
)

type bm struct {
	id    int64
	block int64
}

func main() {

	cluster := gocql.NewCluster("127.0.0.1")
	cluster.Keyspace = "hotbox"
	cluster.Consistency = gocql.One
	cluster.Timeout = 5 * time.Second
	cluster.RetryPolicy = gocql.RetryPolicy{NumRetries: 10}
	s, e := cluster.CreateSession()
	if e != nil {
		fmt.Println(e)
		return
	}
	s.Query(`CREATE TABLE IF NOT EXISTS bitmap2 (bitmap_id bigint,block bigint, PRIMARY KEY (bitmap_id) )`).Exec()
	s.Query(`truncate bitmap2`).Exec()
	stmt := `INSERT INTO bitmap2 ( bitmap_id, block) VALUES (?,?);`

	for id := 0; id < 32; id++ {
		val := int64(0)
		for i := uint(0); i < 64; i++ {
			b := int64(1) << i
			val |= b
			s.Query(stmt, id, val).Exec()
		}
	}
}